Methods of machine shop work : for apprentices and students in technical and trade schools (1914)
Halsey, Frederick A. (Frederick Arthur), 1856-1935 · New York : McGraw-Hill · leaf 63
Fig. 36.—A large index plate. The magnetic circuits of electric generators and motors arebuilt up of punchings of sheet steel. In small machines thesepunchings are complete rings but, as the size increases, it soonbecomes impracticable to follow this plan and the rings are madeof segments. Under… … Fig. 37.—Second melhod of using the large index plale.
Machine-shop practice
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